/*
 * Copyright (C) 2001-2011 Jacek Sieka, arnetheduck on gmail point com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef DCPLUSPLUS_DCPP_SINGLETON_H
#define DCPLUSPLUS_DCPP_SINGLETON_H

#include "debug.h"

template<typename T>
class Singleton
{
	public:
		Singleton() { }
		virtual ~Singleton() { }
		
		static bool isValidInstance() //[+]PPA
		{
			return instance != NULL;
		}
		static T* getInstance()
		{
#ifdef _DEBUG
			if (!instance)
				::MessageBoxA(NULL, typeid(T).name(), "getInstance is null", MB_OK);
#endif
			dcassert(instance);
			return instance;
		}
		
		static void newInstance()
		{
			if (instance)
				delete instance;
				
			instance = new T();
		}
		
		static void deleteInstance()
		{
			if (instance)
				delete instance;

			instance = NULL;
		}
	protected:
		static T* instance;
	private:
		Singleton(const Singleton&);
		Singleton& operator=(const Singleton&);
		
};

template<class T> T* Singleton<T>::instance = NULL;

#endif // DCPLUSPLUS_DCPP_SINGLETON_H

/**
 * @file
 * $Id: Singleton.h 568 2011-07-24 18:28:43Z bigmuscle $
 */
